Well what a bolt this is a word used in different contents as a their can be a bolt of lightning, Bolt of energy. a Bolt that can be used with a nut and bolt to secure something like a wheel on a car . But in this case it ref to a piece of metal that goes in and out of a case which can be controlled by electric and magnets or a coil even a spring . To allow the bolt to lock the door or unlock it .

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